Direct fuel injection stratified charge engine

Abstract

A Stratified Charge Engine where the main combustion chamber is made into one part of the cylinder head is described. The main combustion chamber in this engine is smaller than in Pre-Mixture Combustion Engines. Other main features of this engines are direct and simultaneous air/fuel injection, installation of a squish area and prevention of combustion in the end-gas zone. The thermal load and the weight of the piston in this engine are lower than in normal Stratified Charge Engines with fuel jet impingement. The fuel jet is kept inside the main combustion chamber, resulting in an higher anti-knocking quality of this engine as compared to Pre-Mixture Combustion Engines.

What I claim is: 
     
       1. A direct fuel injection stratified charge engine comprising: a cylinder block defining a cylinder;   a piston located in said cylinder;   a cylinder head on said cylinder block, said cylinder head defining a squish surface facing said piston, and a pocket defining a main combustion chamber on a circumferential wall facing said piston;   a spark plug in said pocket, wherein the greatest spacing between electrodes of the spark plug and any portion of said pocket is less than the radius of said cylinder; and   a fuel injector located on an inner cylinder wall adjacent said squish surface, said fuel injector located diametrically of said pocket and adapted to simultaneously inject fuel and air without impinging on said squish surface to said pocket during the compression stroke.   
     
     
       2. A direct fuel injection stratified charge engine comprising: a cylinder block defining a cylinder;   a piston located in said cylinder;   a cylinder head on said cylinder block, said cylinder head defining a plurality of pockets each defining a main combustion chamber and are spaced around the cylinder axis, and a squish surface located between said pockets;   a spark plug in each pocket, wherein the greatest spacing between electrodes of the spark plug and any portion of said pocket is less than the radius of said cylinder; and   a multiple hole injector located on said squish surface at the cylinder axis and adapted to simultaneously inject fuel and air without substantially impinging on said squish surface to each pocket during the compression stroke.   
     
     
       3. A direct fuel injection stratified charge engine comprising: a cylinder block defining a cylinder;   a piston located in said cylinder;   a cylinder head on said cylinder block, said cylinder head defining a squish surface facing said piston, and a pocket defining a main combustion chamber on a circumferential wall facing said piston;   a spark plug in said pocket, wherein the greatest spacing between electrodes of the spark plug and any portion of said pocket is less than the radius of said cylinder; and   a fuel injector located on an inner wall of said cylinder head adjacent said center line of said cylinder and adapted to simultaneously inject fuel and air without impinging on said squish surface to said pocket during the compression stroke.